text: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  import django.core.validators
  from django.db import migrations, models
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('auth', '0007_alter_validators_add_error_messages'),
      ]
  
      operations = [
          migrations.AlterField(
              model_name='user',
              name='username',
              field=models.CharField(
                  error_messages={'unique': 'A user with that username already exists.'},
                  help_text='Required. 254 characters or fewer. Letters, digits and @/./+/-/_ only.',
                  max_length=254,
                  unique=True,
                  validators=[
                      django.core.validators.RegexValidator(
                          '^[\\w.@+-]+$', 'Enter a valid username. '
                          'This value may contain only letters, numbers and @/./+/-/_ characters.'
                      ),
                  ],
                  verbose_name='username',
              ),
          ),
      ]
  